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    <div class="doc-nav">
      <a href="#Documentation" class="nav-header">Documentation</a>
      <nav class="nav-content">
        <ul class="nav-list">
          <li>
            <a href="#includes" class="nav-label">Includes</a>
             
            <ul class="nav-sub-list">

              <li>
                <a href="#config.h" class="nav-sub-label">config.h</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_CONFIG_FILE" class="nav-sub-label">MBEDTLS_CONFIG_FILE</a>
              </li>
      

              <li>
                <a href="#ssl.h" class="nav-sub-label">ssl.h</a>
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              <li>
                <a href="#stddef.h" class="nav-sub-label">stddef.h</a>
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              <li>
                <a href="#stdint.h" class="nav-sub-label">stdint.h</a>
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            </ul>
            
          </li>
          <li>
            <a href="#macros" class="nav-label">Macros</a>
             
            <ul class="nav-sub-list">

              <li>
                <a href="#MBEDTLS_NET_SOCKETS_H" class="nav-sub-label">MBEDTLS_NET_SOCKETS_H</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_SOCKET_FAILED" class="nav-sub-label">MBEDTLS_ERR_NET_SOCKET_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_CONNECT_FAILED" class="nav-sub-label">MBEDTLS_ERR_NET_CONNECT_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_BIND_FAILED" class="nav-sub-label">MBEDTLS_ERR_NET_BIND_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_LISTEN_FAILED" class="nav-sub-label">MBEDTLS_ERR_NET_LISTEN_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_ACCEPT_FAILED" class="nav-sub-label">MBEDTLS_ERR_NET_ACCEPT_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_RECV_FAILED" class="nav-sub-label">MBEDTLS_ERR_NET_RECV_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_SEND_FAILED" class="nav-sub-label">MBEDTLS_ERR_NET_SEND_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_CONN_RESET" class="nav-sub-label">MBEDTLS_ERR_NET_CONN_RESET</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_UNKNOWN_HOST" class="nav-sub-label">MBEDTLS_ERR_NET_UNKNOWN_HOST</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_BUFFER_TOO_SMALL" class="nav-sub-label">MBEDTLS_ERR_NET_BUFFER_TOO_SMALL</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_INVALID_CONTEXT" class="nav-sub-label">MBEDTLS_ERR_NET_INVALID_CONTEXT</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_POLL_FAILED" class="nav-sub-label">MBEDTLS_ERR_NET_POLL_FAILED</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_ERR_NET_BAD_INPUT_DATA" class="nav-sub-label">MBEDTLS_ERR_NET_BAD_INPUT_DATA</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_NET_LISTEN_BACKLOG" class="nav-sub-label">MBEDTLS_NET_LISTEN_BACKLOG</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_NET_PROTO_TCP" class="nav-sub-label">MBEDTLS_NET_PROTO_TCP</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_NET_PROTO_UDP" class="nav-sub-label">MBEDTLS_NET_PROTO_UDP</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_NET_POLL_READ" class="nav-sub-label">MBEDTLS_NET_POLL_READ</a>
              </li>
      

              <li>
                <a href="#MBEDTLS_NET_POLL_WRITE" class="nav-sub-label">MBEDTLS_NET_POLL_WRITE</a>
              </li>
      
            </ul>
            
          </li>
          <li>
            <a href="#functions" class="nav-label">Functions</a>
             
            <ul class="nav-sub-list">

              <li>
                <a href="#mbedtls_net_init" class="nav-sub-label">mbedtls_net_init</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_connect" class="nav-sub-label">mbedtls_net_connect</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_bind" class="nav-sub-label">mbedtls_net_bind</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_accept" class="nav-sub-label">mbedtls_net_accept</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_poll" class="nav-sub-label">mbedtls_net_poll</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_set_block" class="nav-sub-label">mbedtls_net_set_block</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_set_nonblock" class="nav-sub-label">mbedtls_net_set_nonblock</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_usleep" class="nav-sub-label">mbedtls_net_usleep</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_recv" class="nav-sub-label">mbedtls_net_recv</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_send" class="nav-sub-label">mbedtls_net_send</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_recv_timeout" class="nav-sub-label">mbedtls_net_recv_timeout</a>
              </li>
      

              <li>
                <a href="#mbedtls_net_free" class="nav-sub-label">mbedtls_net_free</a>
              </li>
      
            </ul>
            
          </li>
          <li>
            <a href="#vars" class="nav-label">Vars</a>
            
            <ul class="nav-sub-list">
            
            </ul>
            
          </li>
          <li>
            <a href="#consts" class="nav-label">Consts</a>
            
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            </ul>
            
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          <li>
            <a href="#types" class="nav-label">Types</a>
            
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            </ul>
            
          </li>
          <li>
            <a href="#typedefs" class="nav-label">Typedefs</a>
             
            <ul class="nav-sub-list">

              <li>
                <a href="#
mbedtls_net_context;
" class="nav-sub-label">
mbedtls_net_context;
</a>
              </li>
      
            </ul>
            
          </li>
        </ul>
      </nav>
    </div>
    <div class="doc-content">
      <h2 id="Documentation" class="doc-title">Documentation</h2>
      <h3 id="includes">Includes</h3>
      

      <h4 id="config.h"><span>config.h</span></h4>
      <pre class="doc-declare"><code>#include "config.h"
</code></pre>
      <pre class="doc-comment">#include "config.h"
</pre>

      <h4 id="MBEDTLS_CONFIG_FILE"><span>MBEDTLS_CONFIG_FILE</span></h4>
      <pre class="doc-declare"><code>#include MBEDTLS_CONFIG_FILE
</code></pre>
      <pre class="doc-comment">#include MBEDTLS_CONFIG_FILE
</pre>

      <h4 id="ssl.h"><span>ssl.h</span></h4>
      <pre class="doc-declare"><code>#include "ssl.h"
</code></pre>
      <pre class="doc-comment">#include "ssl.h"
</pre>

      <h4 id="stddef.h"><span>stddef.h</span></h4>
      <pre class="doc-declare"><code>#include &lt;stddef.h&gt;
</code></pre>
      <pre class="doc-comment">#include <stddef.h>
</pre>

      <h4 id="stdint.h"><span>stdint.h</span></h4>
      <pre class="doc-declare"><code>#include &lt;stdint.h&gt;
</code></pre>
      <pre class="doc-comment">#include <stdint.h>
</pre>
      <h3 id="macros">Macros</h3>
      

      <h4 id="MBEDTLS_NET_SOCKETS_H">Marco <span>MBEDTLS_NET_SOCKETS_H</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_NET_SOCKETS_H
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_SOCKET_FAILED">Marco <span>MBEDTLS_ERR_NET_SOCKET_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_SOCKET_FAILED                    -66 /**< Failed to open a socket. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_CONNECT_FAILED">Marco <span>MBEDTLS_ERR_NET_CONNECT_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_CONNECT_FAILED                   -68 /**< The connection to the given server / port failed. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_BIND_FAILED">Marco <span>MBEDTLS_ERR_NET_BIND_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_BIND_FAILED                      -70 /**< Binding of the socket failed. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_LISTEN_FAILED">Marco <span>MBEDTLS_ERR_NET_LISTEN_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_LISTEN_FAILED                    -72 /**< Could not listen on the socket. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_ACCEPT_FAILED">Marco <span>MBEDTLS_ERR_NET_ACCEPT_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_ACCEPT_FAILED                    -4A /**< Could not accept the incoming connection. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_RECV_FAILED">Marco <span>MBEDTLS_ERR_NET_RECV_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_RECV_FAILED                      -4C /**< Reading information from the socket failed. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_SEND_FAILED">Marco <span>MBEDTLS_ERR_NET_SEND_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_SEND_FAILED                      -4E /**< Sending information through the socket failed. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_CONN_RESET">Marco <span>MBEDTLS_ERR_NET_CONN_RESET</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_CONN_RESET                       -80 /**< Connection was reset by peer. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_UNKNOWN_HOST">Marco <span>MBEDTLS_ERR_NET_UNKNOWN_HOST</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_UNKNOWN_HOST                     -82 /**< Failed to get an IP address for the given hostname. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_BUFFER_TOO_SMALL">Marco <span>MBEDTLS_ERR_NET_BUFFER_TOO_SMALL</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_BUFFER_TOO_SMALL                 -67 /**< Buffer is too small to hold the data. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_INVALID_CONTEXT">Marco <span>MBEDTLS_ERR_NET_INVALID_CONTEXT</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_INVALID_CONTEXT                  -69 /**< The context is invalid, eg because it was free()ed. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_POLL_FAILED">Marco <span>MBEDTLS_ERR_NET_POLL_FAILED</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_POLL_FAILED                      -71 /**< Polling the net context failed. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_ERR_NET_BAD_INPUT_DATA">Marco <span>MBEDTLS_ERR_NET_BAD_INPUT_DATA</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_ERR_NET_BAD_INPUT_DATA                   -73 /**< Input invalid. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_NET_LISTEN_BACKLOG">Marco <span>MBEDTLS_NET_LISTEN_BACKLOG</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_NET_LISTEN_BACKLOG        10 /**< The backlog that listen() should use. */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_NET_PROTO_TCP">Marco <span>MBEDTLS_NET_PROTO_TCP</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_NET_PROTO_TCP 0 /**< The TCP transport protocol */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_NET_PROTO_UDP">Marco <span>MBEDTLS_NET_PROTO_UDP</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_NET_PROTO_UDP 1 /**< The UDP transport protocol */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_NET_POLL_READ">Marco <span>MBEDTLS_NET_POLL_READ</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_NET_POLL_READ 1 /**< Used in \c mbedtls_net_poll to check for pending data  */
</code></pre>
      <pre class="doc-comment"></pre>

      <h4 id="MBEDTLS_NET_POLL_WRITE">Marco <span>MBEDTLS_NET_POLL_WRITE</span></h4>
      <pre class="doc-declare"><code>#define MBEDTLS_NET_POLL_WRITE 2 /**< Used in \c mbedtls_net_poll to check if write possible */
</code></pre>
      <pre class="doc-comment"></pre>
      <h3 id="functions">Functions</h3>
      

      <h4 id="mbedtls_net_init">Func <span>mbedtls_net_init</span></h4>
      <pre class="doc-declare"><code>void mbedtls_net_init( mbedtls_net_context *ctx );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Initialize a context
 *                 Just makes the context ready to be used or freed safely.
 *
 * \param ctx      Context to initialize
 */</pre>

      <h4 id="mbedtls_net_connect">Func <span>mbedtls_net_connect</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, const char *port, int proto );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Initiate a connection with host:port in the given protocol
 *
 * \param ctx      Socket to use
 * \param host     Host to connect to
 * \param port     Port to connect to
 * \param proto    Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
 *
 * \return         0 if successful, or one of:
 *                      MBEDTLS_ERR_NET_SOCKET_FAILED,
 *                      MBEDTLS_ERR_NET_UNKNOWN_HOST,
 *                      MBEDTLS_ERR_NET_CONNECT_FAILED
 *
 * \note           Sets the socket in connected mode even with UDP.
 */</pre>

      <h4 id="mbedtls_net_bind">Func <span>mbedtls_net_bind</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Create a receiving socket on bind_ip:port in the chosen
 *                 protocol. If bind_ip == NULL, all interfaces are bound.
 *
 * \param ctx      Socket to use
 * \param bind_ip  IP to bind to, can be NULL
 * \param port     Port number to use
 * \param proto    Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
 *
 * \return         0 if successful, or one of:
 *                      MBEDTLS_ERR_NET_SOCKET_FAILED,
 *                      MBEDTLS_ERR_NET_BIND_FAILED,
 *                      MBEDTLS_ERR_NET_LISTEN_FAILED
 *
 * \note           Regardless of the protocol, opens the sockets and binds it.
 *                 In addition, make the socket listening if protocol is TCP.
 */</pre>

      <h4 id="mbedtls_net_accept">Func <span>mbedtls_net_accept</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
                       mbedtls_net_context *client_ctx,
                       void *client_ip, size_t buf_size, size_t *ip_len );</code></pre>
      <pre class="doc-comment">/**
 * \brief           Accept a connection from a remote client
 *
 * \param bind_ctx  Relevant socket
 * \param client_ctx Will contain the connected client socket
 * \param client_ip Will contain the client IP address, can be NULL
 * \param buf_size  Size of the client_ip buffer
 * \param ip_len    Will receive the size of the client IP written,
 *                  can be NULL if client_ip is null
 *
 * \return          0 if successful, or
 *                  MBEDTLS_ERR_NET_ACCEPT_FAILED, or
 *                  MBEDTLS_ERR_NET_BUFFER_TOO_SMALL if buf_size is too small,
 *                  MBEDTLS_ERR_SSL_WANT_READ if bind_fd was set to
 *                  non-blocking and accept() would block.
 */</pre>

      <h4 id="mbedtls_net_poll">Func <span>mbedtls_net_poll</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_poll( mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Check and wait for the context to be ready for read/write
 *
 * \param ctx      Socket to check
 * \param rw       Bitflag composed of MBEDTLS_NET_POLL_READ and
 *                 MBEDTLS_NET_POLL_WRITE specifying the events
 *                 to wait for:
 *                 - If MBEDTLS_NET_POLL_READ is set, the function
 *                   will return as soon as the net context is available
 *                   for reading.
 *                 - If MBEDTLS_NET_POLL_WRITE is set, the function
 *                   will return as soon as the net context is available
 *                   for writing.
 * \param timeout  Maximal amount of time to wait before returning,
 *                 in milliseconds. If \c timeout is zero, the
 *                 function returns immediately. If \c timeout is
 *                 -1u, the function blocks potentially indefinitely.
 *
 * \return         Bitmask composed of MBEDTLS_NET_POLL_READ/WRITE
 *                 on success or timeout, or a negative return code otherwise.
 */</pre>

      <h4 id="mbedtls_net_set_block">Func <span>mbedtls_net_set_block</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_set_block( mbedtls_net_context *ctx );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Set the socket blocking
 *
 * \param ctx      Socket to set
 *
 * \return         0 if successful, or a non-zero error code
 */</pre>

      <h4 id="mbedtls_net_set_nonblock">Func <span>mbedtls_net_set_nonblock</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_set_nonblock( mbedtls_net_context *ctx );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Set the socket non-blocking
 *
 * \param ctx      Socket to set
 *
 * \return         0 if successful, or a non-zero error code
 */</pre>

      <h4 id="mbedtls_net_usleep">Func <span>mbedtls_net_usleep</span></h4>
      <pre class="doc-declare"><code>void mbedtls_net_usleep( unsigned long usec );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Portable usleep helper
 *
 * \param usec     Amount of microseconds to sleep
 *
 * \note           Real amount of time slept will not be less than
 *                 select()'s timeout granularity (typically, 10ms).
 */</pre>

      <h4 id="mbedtls_net_recv">Func <span>mbedtls_net_recv</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Read at most 'len' characters. If no error occurs,
 *                 the actual amount read is returned.
 *
 * \param ctx      Socket
 * \param buf      The buffer to write to
 * \param len      Maximum length of the buffer
 *
 * \return         the number of bytes received,
 *                 or a non-zero error code; with a non-blocking socket,
 *                 MBEDTLS_ERR_SSL_WANT_READ indicates read() would block.
 */</pre>

      <h4 id="mbedtls_net_send">Func <span>mbedtls_net_send</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Write at most 'len' characters. If no error occurs,
 *                 the actual amount read is returned.
 *
 * \param ctx      Socket
 * \param buf      The buffer to read from
 * \param len      The length of the buffer
 *
 * \return         the number of bytes sent,
 *                 or a non-zero error code; with a non-blocking socket,
 *                 MBEDTLS_ERR_SSL_WANT_WRITE indicates write() would block.
 */</pre>

      <h4 id="mbedtls_net_recv_timeout">Func <span>mbedtls_net_recv_timeout</span></h4>
      <pre class="doc-declare"><code>int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
                     uint32_t timeout );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Read at most 'len' characters, blocking for at most
 *                 'timeout' seconds. If no error occurs, the actual amount
 *                 read is returned.
 *
 * \param ctx      Socket
 * \param buf      The buffer to write to
 * \param len      Maximum length of the buffer
 * \param timeout  Maximum number of milliseconds to wait for data
 *                 0 means no timeout (wait forever)
 *
 * \return         the number of bytes received,
 *                 or a non-zero error code:
 *                 MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out,
 *                 MBEDTLS_ERR_SSL_WANT_READ if interrupted by a signal.
 *
 * \note           This function will block (until data becomes available or
 *                 timeout is reached) even if the socket is set to
 *                 non-blocking. Handling timeouts with non-blocking reads
 *                 requires a different strategy.
 */</pre>

      <h4 id="mbedtls_net_free">Func <span>mbedtls_net_free</span></h4>
      <pre class="doc-declare"><code>void mbedtls_net_free( mbedtls_net_context *ctx );</code></pre>
      <pre class="doc-comment">/**
 * \brief          Gracefully shutdown the connection and free associated data
 *
 * \param ctx      The context to free
 */</pre>
      <h3 id="vars">Vars</h3>
      
      <h3 id="consts">Consts</h3>
      
      <h3 id="types">Types</h3>
      
      <h3 id="typedefs">Typedefs</h3>
      

      <h4 id="
mbedtls_net_context;
">Typedef <span>
mbedtls_net_context;
</span></h4>
      <pre class="doc-declare"><code>typedef struct mbedtls_net_context
{
   int fd;            /**< The underlying file descriptor                 */
}
mbedtls_net_context;
</code></pre>
      <pre class="doc-comment">/**
 * Wrapper type for sockets.
 *
 * Currently backed by just a file descriptor, but might be more in the future
 * (eg two file descriptors for combined IPv4 + IPv6 support, or additional
 * structures for hand-made UDP demultiplexing).
 */</pre>
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